Ultrasonic Welding How It Changes with Construction and Elastane Content
Ultrasonic Welding does not stay constant when construction changes. Understanding the direction of change helps during development.
Effect of knit structure
Loop length and density move results first, usually before any yarn change is made. Working figures for Ultrasonic Welding normally sit around no thread required in mainstream production. Note welding machine with rotary horn on the tech pack so nobody tests against an older revision.
Effect of elastane content
More elastane raises recovery but changes the value measured by welding machine with rotary horn, so retest after any blending change. Record elastane content alongside Ultrasonic Welding, because blends shift the measured value. A result outside no thread required usually points to process drift rather than to the fibre itself.
Effect of finishing
Heat setting and softeners shift results, which explains differences between a hand sample and bulk. Keeping reference values for Ultrasonic Welding lets suppliers quote without extra sampling rounds. Ask for conditioning details together with welding machine with rotary horn, since both affect the reading.
Typical range
Working values stay around no thread required for mainstream activewear. Working figures for Ultrasonic Welding normally sit around no thread required in mainstream production. Note welding machine with rotary horn on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against welding machine with rotary horn before moving to the next sample round. Record elastane content alongside Ultrasonic Welding, because blends shift the measured value. A result outside no thread required usually points to process drift rather than to the fibre itself.
